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Long-term logging study demonstrates impacts on chimpanzees and gorillas (Republic of Congo)

November 27, 2017

Chicago (November 27, 2017) - Research has shown human disturbance can have detrimental effects on great ape populations but now, due to a study published in Biological Conservation on Nov. 27 by Lincoln Park Zoo, there is evidence showing how selective logging impacts chimpanzees and gorilla populations differently by utilizing data collected before, during and after timber extraction.

David Morgan, Ph.D., of the Lester E. Fisher Center for the Study and Conservation of Apes, is used to uncharted territory, spending most of his days in a remote region of the Republic of Congo, a one-of-a-kind ecosystem called Goualougo Triangle that chimpanzees and western lowland gorillas call home. Morgan has developed crucial relationships with community and conservation partners, including the Wildlife Conservation Society, but ventured into a new type of uncharted territory by creating an open dialogue and data-sharing relationship with the local timber company. The Forest Stewardship Council (FCS)-certified company offered to provide its timber inventory, and in turn, zoo researchers were able to provide information on ape nesting, feeding ecology and range to help minimize the displacement of these endangered primates.

While the Goualougo Triangle is a protected area, the site for selective logging - 1 to 3 trees per hectare (equivalent to the size of two football fields) - is also inhabited by chimpanzees and gorillas as it borders the Nouabale-Ndoki National Forest.

Culminating these data provided statistically significant results. Western lowland gorillas avoided areas during timber extraction but returned after logging had passed through the area, in order to feed on the lush herbaceous ground vegetation. On the other hand, chimpanzees who thrive high in the tree's canopy were less likely or slower to return to their native habitat. Crucial to the protection of the returning ape troops are ecoguards who protect the newly-accessible forest due to the human disturbance.

This unprecedented study was only possible due to the long-term dedication of Goualougo Triangle Ape Project staff and cooperation with the local timber company. Researchers remain in the field year-round studying these complex creatures to continue to find the best ways to preserve their populations.
Learn more about the Goualougo Triangle Ape Project at The full manuscript will be available in Biological Conservation on Nov. 27.


Media Contacts:
Jillian Braun
Emily Altimari


Lincoln Park Zoo inspires communities to create environments where wildlife will thrive in our urbanizing world. The zoo is a leader in local and global conservation, animal care and welfare, learning, and science. A historic Chicago landmark founded in 1868, the not-for-profit Lincoln Park Zoo, is a privately-managed, member-supported organization and is free and open 365 days a year. Visit us at

Lincoln Park Zoo

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